<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <script src="./lib/vue.js"></script>
</body>
</html><!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <h3>{{title}}</h3>
    <h3 v-once>{{title}}</h3>
  </div>

  <script src="./lib/vue.js"></script>
  <script>
    let vm = new Vue({
      el: '#app',
      data: {
        title: 'hello'
      }
    })
  </script>
</body>

</html>